Wellhead latch and removal systems
a technology of removal system and latch, which is applied in the direction of sealing/packing, drilling pipes, and accessories of wells, etc., and can solve problems such as the abandonment of wells
Active Publication Date: 2014-06-12
WELLBORE INTEGRITY SOLUTIONS LLC
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Benefits of technology
The patent describes a tool used to remove a wellhead from a subsea well. The tool includes a cutting tool and a wellhead latch assembly that is attached to the cutting tool. The latch assembly has inner and outer parts with pins and cut-outs that can move the latches between a locked position and a released position. The latches are used to secure the tool to the wellhead. The tool is used to separate the wellhead from the casing and remove it from the well. The technical effects of this tool are improved efficiency and ease of use in wellhead removal operations.
Problems solved by technology
A well may be abandoned when the oil or gas reserves of a well are depleted, or when the production costs exceed the expected returns.
Method used
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[0026]In accordance with some aspects of the present disclosure, one or more embodiments herein relate to latch assemblies for coupling to a wellhead. More particularly, one or more embodiments disclosed herein may relate to wellhead latch assemblies used in wellhead abandonment and retrieval processes. An example wellhead latch assembly may be used in connection with a cutting tool that cuts a casing below the wellhead, and allows the cutting tool, wellhead latch assembly, and wellhead to be removed in a single trip.
[0027]Some principles and uses of the teachings of the present disclosure may be better understood with reference to the accompanying description, figures and examples. It is to be understood that the details set forth herein and in the figures are presented as examples, and are not intended to be construed as limitations to the disclosure. Furthermore, it is to be understood that the present disclosure and embodiments related thereto can he carried out or practiced in ...
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A wellhead latch assembly may include one or more latches for attaching to a wellhead and allowing removal of the wellhead during a well abandonment process. The wellhead latch assembly may include an inner core coupled to the latches, and an outer sleeve for selectively latching and unlatching the latches to the wellhead. The inner core may abut the wellhead and can include a groove having circumferential and / or longitudinal features. The outer sleeve may include a pin which travels within the groove and a set of cut-outs for alignment with the latches. When the cut-outs align with the latches, the latches may expand radially outward and disengage the wellhead. As the outer sleeve moves axially or rotationally relative to the inner core, the latches may fall out of alignment with the cut-outs and move radially inwardly to engage or capture the wellhead.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of, and priority to, U.S. Patent Application Ser. No. 61 / 734738, filed on Dec. 7, 2012, and entitled “WELLHEAD LATCH AND REMOVAL SYSTEMS,” which application is incorporated herein by this reference in its entirety.BACKGROUND[0002]When an oil or gas well is formed, a borehole is drilled into the subterranean formation and extended to the location of an oil or gas deposit. At the surface of the borehole, a wellhead may be used. The wellhead may provide pressure containment capabilities for controlling pressure developed within the borehole. The wellhead may also provide a physical, structural interface for drilling and production equipment operating within the borehole.[0003]A well may be abandoned when the oil or gas reserves of a well are depleted, or when the production costs exceed the expected returns. At that time the well may be plugged in accordance with environmental and regulatory requirements. ...
Claims
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IPC IPC(8): E21B33/068
CPCE21B23/006E21B29/005E21B33/038E21B29/12E21B31/18E21B33/068E21B41/0007
InventorSTOKES, DAVID A.FORD, JAMES R.HEKELAAR, STEPHENWARDLEY, MICHAEL T.
OwnerWELLBORE INTEGRITY SOLUTIONS LLC